JOHNS HOPKINS APL TECHNICAL DIGEST, VOLUME 31, NUMBER 2 (2012) 150 INTRODUCTION Need The DoD has a mission need to engage moving tar- gets in an urban setting in clear and adverse weather conditions. Unfortunately, there are issues that prevent this capability from being realized with conventional airborne targeting and weapon platforms. The first issue is an inability of conventional ground-based and airborne intelligence, surveillance, reconnaissance, and targeting systems to reliably maintain custody of the moving target track identification (ID) throughout the kill chain. As was demonstrated in a recent kill chain analysis by APL, 1 vertical urban obstructions and low cloud ceilings prevent these systems from reliably main- he DoD has a mission need to engage moving targets in an urban setting in clear and adverse weather conditions. To address this mission need and overcome the limitations associated with conventional airborne targeting and weapon platforms, APL embarked on an independent research and development (IR&D) effort to weaponize a small unmanned aerial system (UAS) that is capable of cooperating with currently fielded small UASs to execute the entire kill chain (find, fix, track, target, engage, and assess). The main objectives of the IR&D effort were to plan a mission using a UAS simulation environment, demonstrate the enabling technologies that would allow a group of cooperating small UASs to execute the entire kill chain in a complex aerodynamic environment, and demonstrate the lethality of a small UAS- compatible warhead. The accomplishment of these IR&D objectives led to a successful demonstration of the cooperative hunter/killer UAS concept performing convoy protec- tion at the Joint Expeditionary Forces Experiment 2010 (JEFX 10) at the Nevada Test and Training Range. Enabling Technologies for Small Unmanned Aerial System Engagement of Moving Urban Targets Brian K. Funk, Robert J. Bamberger, Jeffrey D. Barton, Alison K. Carr, Jonathan C. Castelli, Austin B. Cox, David G. Drewry Jr., Sarah H. Popkin, and Adam S. Watkins